As per rules of the competition putting this up in here.

Last year the United Cavers Exploration Team (www.ucet.org.uk) built a train and lowered it down into the Milwr Tunnel system. Miles of track had to be cleared and repaired but the train finally made the journey from Cae Mawr shaft to The Lake.

The following video shows the story of the UCET train.

https://youtu.be/qbzgPuH8oq8

Loved it, thanks so much for posting 

Awesome! And I thought lugging camera kit was hard work! Great effort, fab film.

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chunky said:

Awesome! And I thought lugging camera kit was hard work! Great effort, fab film.

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My thought too